Where is the changes log for International Address?

Hi Guru's,

I am working on a program to detect changes on the International Address in Customer Master.

So far, I able to get some info from CDHDR table via object ADRESSE.

Question is in the Object Value: "BP 0000047164"?

I know 0000047164 number is from ADRC table but what about "BP "?

Please help me to kill my headache on this, thank you.